Finding previously purchased apps

[UKFan643]

So I used to own an iPod touch. This was the first gen when they were first released. I know I bought a bunch of apps when I had it. One of those was flight control. Today, on my new iPhone, I went to download it again and it told me that it would be free because I had a previously purchased copy. I'm wondering now if there is any way to figure out what other apps I may have bought that would transfer to my iPhone. Any help will be greatly appreciated.